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Related Experiment Videos

Assessing the impact of essential tremor on upper limb function

P G Bain1, J Mally, M Gresty

  • 1MRC Human Movement and Balance Unit, Institute of Neurology, London, UK.

Journal of Neurology
|November 1, 1993
PubMed
Summary

Essential tremor amplitude and frequency change with activity. Tremor severity impacts upper limb function, but simple tasks like drawing spirals or measuring water spillage can assess this effectively.

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Area of Science:

  • Neurology
  • Biomedical Engineering

Background:

  • Essential tremor (ET) is a common neurological disorder affecting motor control.
  • Understanding how ET impacts daily activities is crucial for patient management and therapeutic development.

Purpose of the Study:

  • To compare the effects of essential tremor on three distinct manual tasks.
  • To investigate the relationship between tremor characteristics (amplitude, frequency) and task impairment.
  • To identify practical methods for assessing upper limb function in essential tremor.

Main Methods:

  • Participants performed spiral drawing, cup-holding, and a joystick-controlled tracking test.
  • Tremor amplitude and frequency were measured using accelerometry during tasks and postural maintenance.
  • Correlation analysis was used to examine relationships between tremor metrics and task performance.

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Main Results:

  • Tremor amplitude and frequency varied across different activities and relative to posture.
  • Tremor amplitude generally decreased during tasks compared to posture, with greater reduction in more severe tremors.
  • Task impairments were highly correlated with each other and with postural tremor amplitude and frequency.

Conclusions:

  • Essential tremor significantly impacts manual task performance.
  • Simple clinical assessments, such as spiral drawing and water spillage measurement, are effective for evaluating upper limb function in ET.
  • The concept of tremor 'suppressability' offers a quantifiable measure of tremor reduction during specific tasks.